[Cs3] Correction in Student class

[Md. Islam]

There is a problem in student class. Right now the less than function is as
following:
   friend bool operator< (Student left, Student right){
      return left.lastName_ < right.lastName_ ||
         (left.lastName_ == right.lastName_ &&
          left.firstName_ < left.*lastName_*);
   }

It should be:

   friend bool operator< (Student left, Student right){
      return left.lastName_ < right.lastName_ ||
         (left.lastName_ == right.lastName_ &&
          left.firstName_ < left.*firstName_*);
   }

Thanks
Tamim
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